EP1182804A1 - Transmission power control device and transmission power control method - Google Patents

Transmission power control device and transmission power control method Download PDF

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Publication number
EP1182804A1
EP1182804A1 EP01915704A EP01915704A EP1182804A1 EP 1182804 A1 EP1182804 A1 EP 1182804A1 EP 01915704 A EP01915704 A EP 01915704A EP 01915704 A EP01915704 A EP 01915704A EP 1182804 A1 EP1182804 A1 EP 1182804A1
Authority
EP
European Patent Office
Prior art keywords
value
target sir
transmission power
sir value
power control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01915704A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hideki Kanemoto
Osamu Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP1182804A1 publication Critical patent/EP1182804A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/282—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the speed of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets

Definitions

  • the present invention relates to a transmission power control apparatus and transmission power control method to be applied to a mobile telephone set, a mobile station apparatus such as an information terminal apparatus provided with mobile telephone functions and computer functions, or a base station apparatus that performs radio communication with a mobile station apparatus, or the like, in a mobile communication system.
  • a mobile station apparatus such as an information terminal apparatus provided with mobile telephone functions and computer functions, or a base station apparatus that performs radio communication with a mobile station apparatus, or the like, in a mobile communication system.
  • transmission power control is carried out in both a mobile station apparatus and a base station apparatus in order to ensure adequate communication quality in the receiving-party station apparatus, and to prevent excessive interference being imposed on another station apparatus.
  • transmission power control also, with a method whereby control is performed on the basis of a desired signal (post-demodulation desired signal power) to interference ratio (SIR value), an increase or decrease in transmission power is determined by measuring a received SIR value at a receiving station apparatus and comparing it with a preset target SIR value, and this transmission power control information is conveyed to the transmitting station apparatus.
  • a desired signal post-demodulation desired signal power
  • SIR value interference ratio
  • transmission power control information directs transmission power to be increased if the received SIR value is smaller than the target SIR value, and directs transmission power to be decreased if the received SIR value is greater than the target SIR value.
  • the transmitting station apparatus performs transmission power control based on the conveyed transmission power control information.
  • the target SIR value is set so that received signals ensure the necessary communication quality over a long period, and since fluctuations of the received signals are anticipated, a margin is added to an SIR value for securing the necessary communication quality to set the target SIR value.
  • the margin will be greater than is necessary, and the transmission power of the transmitting station apparatus will be greater than is necessary.
  • This conventional technology is effective when performing target SIR value setting when a mobile station apparatus is stationary, for example, and upward-and-downward fluctuations of the received SIR value are small.
  • This object is achieved by having transmission power control track a deteriorating propagation environment at high speed by shortening a time required to update the target SIR value to increase when setting a target SIR value for transmission power control.
  • FIG.1 is a block diagram showing the configuration of a base station apparatus using a transmission power control apparatus according to Embodiment 1 of the present invention.
  • a feature of Embodiment 1 is that the required communication quality is ensured by having transmission power control track a deteriorating propagation environment at high speed by shortening a time required to update the target SIR value to increase when setting a target SIR value for transmission power control.
  • the base station apparatus 100 shown in FIG.1 is composed of an antenna 101, transmit/received signal separation section 102, radio receiving section 103, despreading section 104, RAKE combining section 105, demodulation section 106, received SIR value measurement section 107, target SIR value setting section 108, SIR comparison/information generating section 109, target SIR value holding section 110, transmission power control information addition section 111, modulation section 112, spreading section 113, and radio transmitting section 114.
  • the antenna 101 performs transmission and reception of signals to and from a mobile station apparatus 200.
  • the transmit/received signal separation section 102 outputs a signal output from the radio transmitting section 114 to the antenna 101, and outputs a signal received at the antenna 101 to the radio receiving section 103.
  • the radio receiving section 103 performs predetermined radio processing on an output signal from the transmit/received signal separation section 102, and the despreading section 104 performs despreading on an output signal from the radio receiving section 103.
  • the RAKE combining section 105 performs RAKE combining on an output signal from the despreading section 104, and the demodulation section 106 performs demodulation on an output signal from the RAKE combining section 105 and extracts received data.
  • the received SIR value measurement section 107 performs measurement of a received SIR value from an output signal from the RAKE combining section 105.
  • the target SIR value setting section 108 performs target SIR value setting based on an output signal from the demodulation section 106. Details of the target SIR value setting operation in the target SIR value setting section 108 will be given later.
  • the SIR comparison/information generating section 109 compares a received SIR value with the target SIR value, and generates transmission power control information so as to make the received SIR value match the target SIR value.
  • the target SIR value holding section 110 holds a target SIR value set by the target SIR value setting section 108.
  • the transmission power control information addition section 111 adds transmission power control information to transmit data.
  • the modulation section 112 performs modulation on an output signal from the transmission power control information addition section 111, and the spreading section 113 performs spreading on an output signal from the modulation section 112.
  • the radio transmitting section 114 performs predetermined radio processing on an output signal from the spreading section 113 and outputs it to the transmit/received signal separation section 102.
  • FIG.2 is a block diagram showing the configuration of a mobile station apparatus according to Embodiment 1 of the present invention.
  • the mobile station apparatus 200 shown in FIG.2 performs radio communication with the base station apparatus 100, and is composed of an antenna 201, transmit/received signal separation section 202, radio receiving section 203, despreading section 204, RAKE combining section 205, demodulation section 206, transmission power information extraction section 207, transmission power control section 208, modulation section 209, spreading section 210, and radio transmitting section 211.
  • the antenna 201 performs transmission and reception of signals to and from the base station apparatus 100.
  • the transmit/received signal separation section 202 outputs a signal output from the radio transmitting section 211 to the antenna 201, and outputs a signal received at the antenna 201 to the radio receiving section 203.
  • the radio receiving section 203 performs predetermined radio processing on an output signal from the transmit/received signal separation section 202, and the despreading section 204 performs despreading on an output signal from the radio receiving section 203.
  • the RAKE combining section 205 performs RAKE combining on an output signal from the despreading section 204.
  • the demodulation section 206 performs demodulation on an output signal from the RAKE combining section 205 and extracts received data.
  • the transmission power information extraction section 207 extracts transmission power information from an output signal from the demodulation section 206.
  • the transmission power control section 208 controls transmission power according to information extracted by the transmission power information extraction section. 207.
  • the modulation section 209 performs transmit data modulation, and the spreading section 210 performs spreading on an output signal from the modulation section 209.
  • the radio transmitting section 211 performs predetermined radio processing on an output signal from the spreading section 210, and outputs it to the transmit/received signal separation section 202.
  • target SIR value setting and updating are carried out by the base station apparatus 100 when performing transmission power control between the base station apparatus 100 and mobile station apparatus 200.
  • a signal transmitted from the mobile station apparatus 200 is output to the radio receiving section 103 via the transmit/received signal separation section 102.
  • this received signal After undergoing predetermined radio processing by the radio receiving section 103, this received signal is despread by the despreading section 104, and undergoes RAKE combining in the RAKE combining section 105. That is to say, the desired signal waveform is obtained by having despread signals of the same frequency raked up along the time axis.
  • This RAKE combining signal is demodulated by the demodulation section 106 and output as received data.
  • the RAKE combining signal is also input to the received SIR value measurement section 107, where received SIR value measurement is carried out.
  • received data output from the demodulation section 106 is input to the target SIR value setting section 108, where received data quality is measured by determining whether there is an error means of a CRC (Cyclic Redundancy Check) or the like. Based on the result of this measurement, a target SIR value is set. This set target SIR value is held in the target SIR value holding section 110.
  • CRC Cyclic Redundancy Check
  • the relative sizes of the received SIR value and target SIR value are compared and transmission power control information for making the received SIR value the target SIR value is generated.
  • This transmission information is added to transmit data by the transmission power control information addition section 111.
  • the signal output from the transmission power control information addition section 111 undergoes primary modulation by the modulation section 112, followed by spreading processing in the spreading section 113.
  • This spread signal is made a transmit signal by being subjected to predetermined radio processing by the radio transmitting section 114, and is transmitted from the antenna 101 via the transmit/received signal separation section 102.
  • a signal transmitted from the base station apparatus 100 is received by the antenna 201 the signal is output to the radio receiving section 203 via the transmit/received signal separation section 202.
  • this received signal After undergoing predetermined radio processing by the radio receiving section 203, this received signal is despread by the despreading section 204, and undergoes RAKE combining in the RAKE combining section 205.
  • This RAKE combining signal is demodulated by the demodulation section 206 and output as received data.
  • Received data is also input to the transmission power information extraction section 207, where transmission power control information is extracted and output to the transmission power control section 208.
  • the transmission power control section 208 a transmit signal output from the radio transmitting section 211 is controlled so as to have power according to the transmission power control information extracted by the transmission power information extraction section 207.
  • step (hereinafter referred to as "ST") 301 the quality of received data obtained after demodulation is detected.
  • that detected received data quality is compared with the desired quality, and if the received data quality is better than the desired quality, the target SIR value is decreased by a predetermined first value in ST303. If the received data quality is poorer than the desired quality, the target SIR value is increased by a predetermined second value in ST304.
  • the target SIR value is set by means of the above operations.
  • the second value is larger than the first value.
  • it may be that the second value 2 x the first value.
  • the target SIR value setting cycle is longer than the transmission power control cycle.
  • transmission power control may be performed every slot, and the target SIR value setting updated based on the frame error rate.
  • control information for a transmission power decrease is generated in ST403, and if smaller, control information for a transmission power increase is generated in ST404.
  • a base station apparatus 100 using a transmission power control apparatus according to Embodiment 1 when the target SIR value is updated, it can be decreased by a predetermined first value or increased by a second value larger than the first value.
  • FIG.5 is a block diagram showing the configuration of a base station apparatus using a transmission power control apparatus according to Embodiment 2 of the present invention. Parts in FIG.5 identical to those in FIG.1 are assigned the same codes as in FIG.1 and their detailed explanations are omitted.
  • a feature of Embodiment 2 is that, by providing a lower limit for target SIR value settings for a transmitting apparatus in which signal quality fluctuations are large because fluctuations in the propagation environment are large, and not setting the target SIR value excessively low, transmission power control is operated efficiently and the required communication quality is ensured even if the propagation environment deteriorates rapidly.
  • the base station apparatus 500 shown in FIG. 5 differs from the base station apparatus 100 in FIG.1 in having, in addition to the configuration elements of base station apparatus 100, a target SIR value control section 501 connected between the target SIR value setting section 108 and target SIR value holding section 110.
  • the target SIR value control section 501 controls the target SIR value held in the target SIR value holding section 110, based on the results of communication quality measurements in the target SIR value setting section 108.
  • target SIR lower limit value a lower limit is provided for the target SIR value (hereinafter referred to as “target SIR lower limit value”), and control is performed so that the target SIR value is not set to be equal to or less than the target SIR lower limit value.
  • control is performed to increase or decrease the target SIR value according to the communication quality in the same way as described in Embodiment 1.
  • the target SIR value setting section 108 acquires the quality of received data obtained by means of demodulation by the demodulation section 106.
  • the target SIR value setting section 108 further compares the acquired received data quality with the desired quality, and sets a target SIR value.
  • the target SIR value control section 501 determines whether a target SIR lower limit value has been set. If a target SIR lower limit value has been set, in ST604 the target SIR value control section 501 determines whether or not the difference value obtained by subtracting a first value from the target SIR value exceeds the target SIR lower limit value.
  • the value obtained by decreasing the target SIR value by the first value is set in the target SIR value holding section 110 as the target SIR value. If, on the other hand, the difference value is equal to or less than the target SIR lower limit value, in ST606 the target SIR value is set directly in the target SIR value holding section 110.
  • the value obtained by decreasing the target SIR value by the first value is set in the target SIR value holding section 110 as the target SIR value.
  • the target SIR value control section 501 increases the target SIR value by a predetermined second value, and sets the target SIR value obtained in this way in the target SIR value holding section 110.
  • a lower limit value is provided for the target SIR value, and control can be performed so that the target SIR value is not set to be equal to or less than the lower limit value.
  • the target SIR value that is updated is not greatly decreased even if the width of fluctuations in received signal quality due to the propagation environment is large, it is possible to ensure the required received SIR value when the target SIR value is next increased.
  • FIG.7 is a block diagram showing the configuration of a base station apparatus using a transmission power control apparatus according to Embodiment 3 of the present invention. Parts in FIG.7 identical to those in FIG.5 are assigned the same codes as in FIG. 5 and their detailed explanations are omitted.
  • a feature of Embodiment 3 is that, by providing a lower limit for a target SIR value setting according to the fluctuation width of movement speed for a transmitting station in which the fluctuation width of speed of movement is large-that is, a mobile station apparatus on the transmitting side in which signal quality fluctuations are large because fluctuations in the propagation environment are large-and not setting the target SIR value excessively low, transmission power control is operated efficiently and the required communication quality is ensured even if the propagation environment deteriorates rapidly.
  • the base station apparatus 700 shown in FIG.7 differs from the base station apparatus 500 in FIG.5 in having, in addition to the configuration elements of base station apparatus 500, a movement speed estimation section 701 connected between the RAKE combining section 105 and target SIR value control section 501.
  • the movement speed estimation section 701 estimates the speed of movement of a mobile station apparatus by measuring fluctuations in the received signal level from a mobile station from the output of the RAKE combining section 105, and outputs this speed of movement to the target SIR value control section 501.
  • a target SIR lower limit value is provided, and control is performed so that the target SIR value is not set to be equal to or less than the target SIR lower limit value. Also, if that fluctuation width does not exceed the threshold value, control is performed to increase or decrease the target SIR value according to the communication quality in the same way as described in Embodiment 1.
  • the movement speed estimation section 701 estimates the speed of movement of the transmitting station apparatus from fluctuations in the level of the received signal demodulated by the demodulation section 106.
  • the target SIR value control section 501 detects the fluctuation width of that estimated speed of movement, and in ST803, compares that fluctuation width with a threshold value.
  • the target SIR value control section 501 sets a target SIR lower limit value. If the fluctuation width is equal to or less than the threshold value, target SIR lower limit value setting is not performed.
  • the speed of movement of a mobile station apparatus is estimated from fluctuations in the received signal level, and if the fluctuation width of that speed of movement exceeds a threshold value, a target SIR lower limit value is provided and control can be performed so that the target SIR value is not set to be equal to or less than the lower limit value.
  • the target SIR value that is updated is greatly decreased and the required received SIR value cannot be ensured.
  • the target SIR value that is updated is not greatly decreased even if the width of fluctuations in received signal quality due to the speed of movement is large.
  • Embodiments 1 through 3 a configuration has been described in which a base station apparatus is equipped with transmission power control information generating means, and a mobile station apparatus is equipped with transmission power control means responsive to that transmission power control information.
  • the same kind of effect as described above can also be obtained if, conversely, a mobile station apparatus is equipped with transmission power control information generating means, and a base station apparatus is equipped with transmission power control means.
  • target and required Eb/N0 values may be used instead of target and required SIR values .
  • use in a similar way is also possible in an apparatus employing, instead of the CDMA method, a different modulation/demodulation method or multi-access method, such as a TDMA (Time Division Multiple Access) method or OFDM (Orthogonal Frequency Division Multiplex) method.
  • TDMA Time Division Multiple Access
  • OFDM Orthogonal Frequency Division Multiplex
  • the amount of margin applied to a target SIR lower limit value or required SIR value may be made variable. That is to say, it is also possible to observe target SIR value fluctuations, received signal quality, and the like, over a long period, and control them adaptively.
  • the present invention it is possible to prevent delay in updating of a target SIR value and to assure communication quality even in a case where the propagation environment deteriorates rapidly, when target SIR value updating is carried out at the time of transmission power control by means of comparison between a received SIR value and target SIR value.
  • the present invention is suitable for use in a mobile telephone set, a mobile station apparatus such as an information terminal apparatus provided with mobile telephone functions and computer functions, or a base station apparatus that performs radio communication with a mobile station apparatus, or the like, in a mobile communication system.
  • a mobile station apparatus such as an information terminal apparatus provided with mobile telephone functions and computer functions, or a base station apparatus that performs radio communication with a mobile station apparatus, or the like, in a mobile communication system.
EP01915704A 2000-03-28 2001-03-22 Transmission power control device and transmission power control method Withdrawn EP1182804A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000089279 2000-03-28
JP2000089279A JP3480710B2 (ja) 2000-03-28 2000-03-28 送信電力制御装置及び送信電力制御方法
PCT/JP2001/002287 WO2001073976A1 (fr) 2000-03-28 2001-03-22 Dispositif et procede de commande de puissance d'emission

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EP1182804A1 true EP1182804A1 (en) 2002-02-27

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US (1) US6862458B2 (pt)
EP (1) EP1182804A1 (pt)
JP (1) JP3480710B2 (pt)
KR (1) KR100440105B1 (pt)
CN (1) CN1162988C (pt)
AU (1) AU4275201A (pt)
BR (1) BR0105387A (pt)
WO (1) WO2001073976A1 (pt)

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KR100440105B1 (ko) 2004-07-14
US20020160799A1 (en) 2002-10-31
KR20020026438A (ko) 2002-04-10
US6862458B2 (en) 2005-03-01
AU4275201A (en) 2001-10-08
CN1364356A (zh) 2002-08-14
WO2001073976A1 (fr) 2001-10-04
JP3480710B2 (ja) 2003-12-22
BR0105387A (pt) 2002-02-19
JP2001274748A (ja) 2001-10-05
CN1162988C (zh) 2004-08-18

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